Model 109
Bourdon Type
± 1/2% or ± 1% Full Scale Accuracy
The Model 109 is powered by a test-quality Bourdon tube assembly, fixed at one end with a high-pressure inlet and free to move at the other. This assembly is housed in a pressure chamber that is fitted with a high-pressure connection to the inside of the Bourdon tube and a low-pressure connection to the pressure chamber and the outside of the Bourdon tube. As the pressure inside the Bourdon tube rises above the chamber pressure, the tube straightens, and its free end moves in response to the differential pressure.
This motion is transferred through an adjustable linkage to a precision rack-and-pinion mechanism located at the fixed end. The pinion rotates as the rack moves, and a magnet attached to the pinion transmits this motion through the solid chamber wall to an external magnetic assembly. A pointer, mounted to this external magnet, indicates the pressure differential on a calibrated dial.
To protect the instrument, a bi-directional pressure relief valve is included to guard against over-range in either direction up to the rated working pressure.
NOTE: The use of diaphragm seals is not recommended for Model 109 series gauge. Attempts to install such seals on these gauges will void the warranty
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Product Features/Benefits
- Rugged Bourdon Tube Sensing Element
- Glass Reinforced Thermoplastic Dial case (Panel Mountable)
- Weather Resistant & Corrosion Resistant Gauge Front
- 270° Dial Arc
- Shatter Resistant Lens
- Over-Range Protection, High over Low and Low over High
- 5 Year Warranty
- For complete model details See Bulletin_109.pdf
- Installation and Operation Manual See Bulletin: IOM_109.pdf
Specifications / Configuration
- Dial Sizes available: 4-1/2” and 6” Diameters
- Dial Scale Ranges: 0-15 PSID to 0-6,000 PSID
- Differential Full Scale Ascending Accuracy available: ±1/2% (ASME B40.1 Grade 2A)/±1% (ASME B40.1 Grade 1A)
- Available in a Variety of Dial Scales: Bar, Mbar, kPa, Kg/Cm2, Dual Scale and Square Root for Flow Indication etc.
- Working Pressures up to 6000 PSIG (400 Bar)
- Operating Temp -40°F to +200°F (-40°C to +93°C)
- Weather Protection & Corrosion Resistant
- Material of Construction of Body - Aluminum, Carbon Steel, 316/316L Stainless Steel and Brass (Wetted Part)
- Internal wetted parts-316 Stainless Steel
- Back Process connections
- Optional O-rings Materials Buna-N, Viton, Neoprene, and Ethylene Propylene
- For complete specifications see: Specificationsheet_109.pdf
Common Applications
- Square Root Graduations for Direct Reading Flow Rates
- Pump Performance Testing
- Hydraulic Filter Monitoring
- Heat Exchanger Pressure Drop Monitoring
Additional Options:
- Pipe Mounting Kit - 2" U-Bolt
- Wall Mounting Kit
- Maximum Follower Pointer
- Oxygen Cleaning
- Liquid Fill
- NACE Certificate (Available for Aluminum and Stainless Steel Bodies only)
- CRN – Canadian Registration Number (1500 PSI Safe Working Pressure Stainless Steel Bodies only)
The Mid-West Advantage
- 5 year warranty
- 30 + Years Hazardous Location product manufacturer.
- OEM and Private Label Capabilities
- Fast on-time Deliveries
- Friendly Customer Support
- Certified Quality System CSA B51-19 SAI GLOBAL
- UL Listing
- CSA Listing
| Model No. | Differential Pressure Range | Accuracy | Working Pressure | Electrical Available | Specifications | Installation/ Operation Manual | Electrical IOM | Drawing |
|---|---|---|---|---|---|---|---|---|
| Model 109 | 0-15 PSID to 0-6000 PSID (Dependent on Body Material and Safe working Pressure) | 1/2% or 1% Full Scale (1/2% Not available above 1,000 PSID or Bi-Directional Ranges) NOTE: Bi-Directional Accuracy is 1% Total Span ±3% Total Span (For Ranges above 1,500-0-1,500 PSID) |
Up to 6,000 PSI | None available |
